Needle-clamp for sewing-machines.



B. L. JIROUCH.

NEEDLE CLAMP FOR SEWING MACHINES.

APPLICATIO N FILED MARI 6. I917- needle in that position.

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."BOHUMIL JIRQUCI-L- OF CLEVELAND, OHIO, ASSIGNOR TO WHITE SEWINGMACHINE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

NEEDLE-CLAMP FOR SEWiNG-MACHINES.

To all whom it may concern: 1

Be it known that I, BOI-IUMIL L. JIRoUei-r, a citizen of the'UnitedStates, residing at Cleveland, in the county'of Cuyahoga and State ofOhio, have invented a certain new and useful Improvement inNeedle-Clamps for Sewing-Machines, ofwhich the-following is a full,clear, and exact description.

The object of this invention is to provide inexpensive means by whichone may quickly fasten a needle to the needle bar of a sewing machine,and be sure that said needle will be exactly placed, and will beimmovably held in place.

The invention is shown in the accompanying drawings and hereinafterdescribed and pointed out definitely in the appended claims.

In the drawings, Figure 1 is a front elevation of a needle bar and .aneedle secured thereto by means of the present invention; Fig. 2 is ahorizontal sectional view in the plane of line 22 on Fig. 1; Fig. 3 is aside view of the needle bar.

Referring to the parts by reference characters, 10 represents the needlebar which at its lower end is substantially rectangular in horizontalsection. It has, however, on its left side, a vertical flat surface 12for engagement with the flat surface 21 on the shank 22 of a needle 20.A vertical shoulder 14 is also formed on this same left face of theneedle bar, which shoulder is so placed that when the shank of theneedle engages this vertical shoulder and at the same time the flatsurfaces 21 and 12 are in engagement as stated, the needle is accuratelyplaced with respect to the needle bar.

15 represents the needle clamp, whose function is to push the needleinto the described engagement with said flat surface and verticalshoulder, and rigidly hold the The clamp as shown, is a rectangularsleeve which fits over the rectangular end of the needle bar. It has,however, a vertical rib 16 on the inner face of that side 17 which isopposed to the flat surface 12; and this rib is so placed that it willengage with the convex surface of the needle shank on the opposite sideof the center thereof to that on which said shoulder 14 lies. A setscrew 25 screws through a threaded lug formed externally on the rightside 18 of this clamp, and this Patented May 2d, 191%..

Application filed March 6, 1917. Serial No. 152,460.

screw by engaging the right face of the needle bar, will draw said clamptoward considered, is nevertheless novel, and is as follows:

The clamp consists of a U-shaped piece 15 and the plate 15'. The middlemember of this U-shaped piece has the rib 16 formed on its inner face.The vertical ends of the two sides of the U-shaped member are formedwith slots 15 which engage tongues 15 in the plate 15*, and are upset orriveted down, thereby fastening the two pieces together.

It will be noted that the vertical shoulder 14 and the flat surface 12on the needle bar are respectively one side and the bottom of a verticalgroove formed in the needle bar; but the other side 13 of said groovehas no other function than to serve as a guide to enable the operator tocertainly put the needle in a position where it will be engaged by therib 16 on the clamp, and will thereby be thrust over against the flatsurface, 6. 0., the bottom of the groove, and over against the verticalshoulder or side of the groove.

Having described my invention,'l[ claim 1. In a needle clamp for sewingmachines employing a vertically reciprocating needle bar, thecombination of the vertically reeiprocating needle bar having a verticalflat surface 12 and an adjacent vertical shoulder 14 for engagementrespectively with the flat surface of a needle shank and with saidneedle shank adjacent said flat surface, said needle bar having alsoadjacent the flat surface specified two vertical parallel flat surfacesat substantially right angles to said flat surface, a four sided needleclamp having two side members which slidably engage the two parallelflat surfaces on the needle bar and having opposed to the firstmentioned flat surface on the needle bar a mem ber on the inner face ofwhich is a vertical rib 16 placed to engage the convex surface of theneedle shank at the opposite sides of the center of said shank to thaton which lies the vertical shoulder on the needle bar when said"needle-is in engagement with flat" 2. In a needle clamp for sewingmachines employing a vertically reciprocating needle bar, ;thecombination 'of the vertically yreciprocatingneedlebar having a flatsurface q-andtan adjacent vertical shoulder ;for engagement respectivelywith the flat surface ofia needle shank andwith saidneedle shankadjacent said fiat surface, said needle bar having ,also, adjacent theflat surface specified two vertical parallel flatvsurfaces-at sub-,stantiallyright angles to-saidiflat surface, a 'fourv-sijdedneedleclamp whichembraees the needle bar,sai,d clamp comprising two members,viz. a Ushaped member .-having two sideswhich slidablyengage the two Iparallel vertical sides of the needle bar and an intermediate part onthe'inner surface of which is a verticalrib placed to engage the convexsurfaceof the needle shank on the opposite side of the center thereof tothat on which lies the vertical shoulder on the needle bar, said sidemembers having holes near them ends, and a member having tongues whichenter and are upset in said holes, and a set screw which screws throughthe last mentloned member into contact with the needle bar.

3. -1In-a needle clamp for sewing machines employing a verticallyreciprocating needle bar, the combination of the. verticallyreciprocating needle bar having in its surface averticalrectaugutargroove which is wider thanthe diameter ofthe needle,a four-sided needle clamp having two side members whichslidably engagetheneedle bar, and an mediate the needle bar.

In testimony whereof, I hereunto afiix my signature.

BOHUMIL L. J IROUCH.

,Copi es of patentm ay.bey-obtained for. five cents each, ,by addressingthe Commissioner of'Patents,

Washington, D. G.

